![]() In case of iso-electronic species, the cation with greater positive charge has smaller radius but anion with greater negative charge has the larger radii. Iso-electronic Species: When we find atoms or ions which have same number of electrons, we call them iso-electronic species Advertisements Ionic radius The effective distance from the centre of the nucleus of an ion up to which it has an influence on its electron cloud is called its ionic radius.Ī cation is smaller but the anion is larger than the parent atom. of shells increases and on moving left to right effective nuclear charge increases. It increases from top to bottom and decreases left to right.īecause on increasing down the group, no. Van der Waals ’radius > Metallic radius > Covalent radius Trends of Atomic Radius on Periodic Table This is used for metals Advertisements VAN DER WAALS’ RADIUS: Half the inter-nuclear separation between two similar adjacent atoms belonging to the two neighboring molecules of the same substance in the solid state is called the van der Waals ‘radius of that atom. This is used in case on non-metals METALLIC RADIUS: Half the distance between the nuclei of the two adjacent metal atoms in a close packed lattice of the metal is called its metallic radius. We measure using the below terms for different elements COVALENT RADIUS- Half the inter-nuclear distance between two similar atoms of any element which are covalently bonded to each other by a single covalent bond is called covalent radius. Since it is very small, it is very difficult to measure. Periodic Trends in properties of elements Periodic Trends in Physical Properties Atomic Radius The distance from the centre of the nucleus to the outermost shell of the electrons in the atom of any element is called its atomic radius.
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